Extra-high voltage direct current magnetic field electricity testing device

Abstract

The invention relates to an extra-high-voltage direct-current magnetic field electricity testing device, and the device comprises a magnetic field measurement module which is used for collecting an extra-high-voltage direct-current magnetic field signal; the signal processing module comprises a signal amplification circuit, a filter circuit and a data conversion and processing circuit, the signal amplification circuit is used for amplifying a magnetic field signal received by the three-dimensional magnetic field processing module, the filter circuit is used for removing noise and interference in the signal, and the data conversion and processing circuit is used for converting the signal into a signal which can be identified by the main control module; the main control module receives the magnetic field signal processed by the signal processing circuit, sets an alarm threshold value and controls the sound-light alarm module; the sound-light alarm module is used for sending out a sound-light alarm signal to judge whether the detected system is electrified or not; the switch module is used for opening or closing the extra-high voltage direct current magnetic field electricity testing device; the power module is used for supplying power; compared with other devices, the device provided by the invention has the advantages of high measurement precision, wide measurement range and strong anti-interference capability, and is suitable for a direct-current transmission line with a higher voltage level.

Description

Technical Field

[0001] The invention relates to the field of electric power equipment, and in particular to an ultra-high voltage direct current magnetic field electrical testing device. Background Art

[0002] With the rapid development of modern power systems, high-voltage direct current transmission technology has gradually become an important means to solve the problem of long-distance and large-capacity power transmission with its high efficiency, economy and environmental protection. High-voltage direct current transmission systems can not only effectively reduce transmission losses and improve energy efficiency, but also play an important role in new energy access and grid interconnection. In the field of high-voltage direct current transmission, the power environment is often complex and changeable. When conducting maintenance on ultra-high voltage transmission lines, in order to prevent accidents, the energized condition of the line must be verified. However, with the increase in voltage levels and system complexity, the problem of power testing in high-voltage direct current environments has become increasingly prominent, becoming the key to ensuring the stable operation of the power system and the safety of maintenance personnel.

[0003] At present, the widely used electrometer in the power industry is a contact electrometer based on the principle of capacitive voltage division, that is, the worker holds a retractable insulating protection rod, and the other end of the protection rod is a contact type high-voltage probe, which directly contacts the part that needs to be tested. When the part to be tested is energized, the electrometer will send out an audible and visual alarm signal, indicating that the test result is energized. When it is determined that the part to be tested is not energized, maintenance and other work will be carried out to ensure the personal safety of the staff. Since the contact electrometer needs to directly touch the high voltage, when the insulation performance decreases, there is a risk of electric shock to personnel. Non-contact electrometers are still in the development stage. There are many non-contact electrometer-related studies based on sensors of different principles, mainly including vibration capacitor electric field sensors, field grinding electric field sensors, optical electric field sensors, etc. The conductor of the field grinding sensor induces charges in the electric field. These induced charges are periodically changed by the rotating shielding electrode to obtain current. It is generally used for the measurement of ground electromagnetic environment. It is easy to fail or measure incorrectly in a strong electric field environment. Wang Jiaqi from North China Electric Power University introduced the contactless measurement technology for 10kV distribution network. He used the current transformer based on Rogowski coil as a sensor to measure current. He introduced the characteristics and basic principles of Rogowski coil sensor in detail. He used multi-electric field sensor to measure the electric field strength of the transmission line. However, the disadvantage of this electric test device is that it can only measure the transmission line of a single voltage level. It has great limitations in actual engineering. Li Shanshan from Wuhan University studied the starting characteristics of 220kV capacitive high-voltage tester. During the test, there was a false alarm due to the same-direction interference of surrounding equipment when the device under test was not energized. Electric field sensors based on Pockels effect and Kerr effect are expensive and have high operating requirements. In addition, the sensitivity is greatly affected by frequency and cannot be used for the measurement of DC electric field. my country already has industry standards for non-contact electrometers for UHV AC transmission lines. However, there are currently no relevant standards or universal electrometers for UHV DC transmission lines. Operation and maintenance personnel often use insulated ropes to suspend metal objects close to the conductors or use the sound of discharge to determine whether they are charged. This type of method is greatly affected by the outside world and is prone to misjudgment under noisy or strong light conditions. The electromagnetic environment of UHV DC transmission lines is quite different from that of AC lines, mainly because the charged ions generated by corona discharge on the transmission lines form a spatial ion flow under the action of the DC electric field, which significantly enhances the spatial electric field. The synthetic electric field under the DC transmission line can reach several times the nominal electric field. There are currently no electrometer products for UHV DC environments. Most of the existing electrometers are based on the principle of electric field. Due to problems such as grounding and electromagnetic environment, the measurement accuracy is low and false alarms are easy to occur in UHV environments. Only by developing UHV DC electrometers with strong adaptability, high measurement accuracy and fast response speed for UHV DC environments can stable operation be ensured in various complex and changeable power environments. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes an ultra-high voltage DC magnetic field testing device, which determines the energized state of the line by detecting the magnetic field around the transmission line. It has the advantages of non-contact testing, three-component joint measurement to avoid blind spots and misjudgment, and weakening the influence of ion flow field, providing strong support for the safe inspection and maintenance of the power system.

[0005] To achieve the aforementioned purpose, the present invention provides an ultra-high voltage direct current magnetic field electrical testing device, comprising: a testing device housing and a retractable insulating rod, wherein the testing device housing encapsulates a magnetic field measurement module, a signal processing module, a main control module, an audible and visual alarm module, a power supply module and a switch module; the testing device housing is connected to one end of the retractable insulating rod.

[0006] Optionally, the magnetic field measurement module is used to collect magnetic field signals within the system under test; the signal processing module is used to receive the magnetic field signals collected by the magnetic field sensor and amplify, filter, and perform data conversion processing on the magnetic field signals; the main control module is used to receive the magnetic field signals processed by the signal processing circuit, and compare the processed magnetic field signals with a set threshold signal. If the magnetic field signal is greater than the set threshold signal, the main control module controls the sound and light alarm module to emit a sound and light alarm signal.

[0007] Optionally, the UHV DC magnetic field electrical testing device further includes a switch module connected to the power module.

[0008] Optionally, the UHV DC magnetic field electrical testing device also includes a power supply module.

[0009] Optionally, the sound and light alarm module includes a speaker, a red LED light and a green LED light.

[0010] Optionally, the magnetic field measurement module contains a magnetic field measurement sensor, the magnetic field measurement sensor adopts a double iron core structure, and the measured value is output through a communication interface.

[0011] Optionally, a magnetic field measurement module, a signal processing module, a main control module, an sound and light alarm module, a power supply module and a switch module are encapsulated in the shell of the electrical testing device; the main control module receives the signal processed by the signal processing module and compares it with a set threshold to control the sound and light alarm module to emit a sound and light alarm signal or be in standby mode.

[0012] Optionally, the housing of the electrical testing device is connected to one end of the retractable insulating rod.

[0013] Optionally, the electroscope has a self-test function; Press the self-test button of the tester. If the tester can work normally, the test indicator should send out a clear sound and light alarm signal. The sound and light alarm signal means that the tester should send out a continuous or intermittent alarm sound, and the indicator light should light up or flash.

[0014] A method for testing electric power in an ultra-high voltage direct current magnetic field is implemented based on an electric power testing device. The method is as follows: turning on the power switch of the electric power testing device, starting the electric power testing function of the electric power testing device, the electric power testing device automatically collects magnetic field data, measures the magnetic field at a specified test point, and when the magnetic field is higher than an alarm threshold, an audible and visual alarm module performs an effective alarm. Turning on the power switch of the electric power testing device, starting the electric power testing function of the electric power testing device, the electric power testing device automatically collects magnetic field data, measures the magnetic field at a specified test point, and when the magnetic field is higher than the alarm threshold, the audible and visual alarm module performs an effective alarm.

[0015] The beneficial effects provided by the present invention are: The UHV DC test device of the present invention adopts an integrated structural design, including a magnetic field measurement module, a signal processing module, a main control module, an audible and visual alarm module, a switch module, a power supply module, and a good insulating shell. The test device has high sensitivity and a compact structure. The magnetic field around the UHV DC transmission line is generated by the high-voltage DC transmission conductor itself and the earth's magnetic field. Considering the effect of the earth's magnetic field, the magnetic field around the UHV DC transmission line is When the three-dimensional magnetic field test module is working, it tests the magnetic field data and compares it with the preset alarm threshold. When the magnetic field is higher than the alarm threshold, the sound and light alarm module will give an effective alarm. When the magnetic field is lower than the alarm threshold, no alarm will be given. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the housing structure of the UHV DC magnetic field electrical testing device according to Example 1 of the present invention; Figure 2This is a module diagram of an ultra-high voltage direct current magnetic field test circuit according to Embodiment 1 of the present invention; Figure 3 Schematic diagram of the ultra-high voltage direct current magnetic field horizontal electric test operation mode of the present invention Figure 4 Schematic diagram of the vertical electric test operation mode of the UHV DC magnetic field of the present invention Figure numerals: 1 - housing of the electrical testing device, 2 - retractable insulating rod, 3 - red LED light, 4 - green LED light, 5 - speaker, 6 - communication interface, 7 - power switch, 8 - charging interface, 9 - screw hole. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0018] Before formally describing the present invention, the scheme of the present invention is first generally described for easy understanding.

[0019] Please refer to Figure 1 , Figure 1 It is a schematic diagram of the shell structure of the ultra-high voltage direct current magnetic field electrical testing device of the present invention.

[0020] The shell of the electric test device and the retractable insulating rod, the shell of the electric test device encapsulates a magnetic field measurement module, a signal processing module, a main control module, an audible and visual alarm module, a power supply module and a switch module; the shell of the electric test device is connected to one end of the retractable insulating rod.

[0021] It should be noted that the magnetic field measurement module is used to collect magnetic field signals in the system under test; the signal processing module is used to receive the magnetic field signals collected by the magnetic field sensor and amplify, filter, and perform data conversion processing on the magnetic field signals; the main control module is used to receive the magnetic field signals processed by the signal processing circuit, and compare the processed magnetic field signals with the set threshold signal. If the magnetic field signal is greater than the set threshold signal, the main control module controls the sound and light alarm module to send out a sound and light alarm signal.

[0022] It should be noted that the UHV DC magnetic field electrical testing device further includes a switch module connected to the power module.

[0023] It should be noted that the UHV DC magnetic field electrical testing device also includes a power supply module.

[0024] It should be noted that the sound and light alarm module includes a speaker, a red LED light and a green LED light.

[0025] It should be noted that the magnetic field measurement module contains a magnetic field measurement sensor, which adopts a double-core structure, and the measured value is output through a communication interface.

[0026] It should be noted that the shell of the electrical testing device encapsulates a magnetic field measurement module, a signal processing module, a main control module, an sound and light alarm module, a power supply module and a switch module; the main control module receives the signal processed by the signal processing module and compares it with the set threshold to control the sound and light alarm module to send out a sound and light alarm signal or be in standby mode.

[0027] It should be noted that the housing of the electrical testing device is connected to one end of the telescopic insulating rod.

[0028] It should be noted that the electroscope has a self-test function; Press the self-test button of the tester. If the tester can work normally, the test indicator should send out a clear sound and light alarm signal. The sound and light alarm signal means that the tester should send out a continuous or intermittent alarm sound, and the indicator light should light up or flash.

[0029] A method for testing electric power in an ultra-high voltage direct current magnetic field is implemented based on an electric power testing device. The method is as follows: turning on the power switch of the electric power testing device, starting the electric power testing function of the electric power testing device, the electric power testing device automatically collects magnetic field data, measures the magnetic field at a specified test point, and when the magnetic field is higher than an alarm threshold, an audible and visual alarm module performs an effective alarm. Turning on the power switch of the electric power testing device, starting the electric power testing function of the electric power testing device, the electric power testing device automatically collects magnetic field data, measures the magnetic field at a specified test point, and when the magnetic field is higher than the alarm threshold, the audible and visual alarm module performs an effective alarm.

[0030] The working process of the present invention is as follows: Before performing the electrical test, first check the integrity of the tester casing to ensure that there are no cracks, breaks, or disconnections on the tester casing, and that there are no signs of oil, water stains, wear, etc.

[0031] Then, perform a self-test on the tester. The operator presses the self-test button of the tester with his finger. If the tester can work normally, the tester indicator should send out a clear sound and light alarm signal. The sound and light alarm signal means that the tester should send out a continuous or intermittent alarm sound, and the indicator light should light up or flash. If there is no sound and light indication signal during the self-test, check whether the battery in the tester is correctly installed and whether the battery power is sufficient. If the battery power is insufficient, replace the battery before performing the self-test.

[0032] After the self-test is passed, the staff will conduct an electrical test in the actual high-voltage DC transmission environment. The staff will wear personal protective equipment such as insulating gloves and insulating shoes, and climb up the crossarm to perform the electrical test. In order to ensure the safety of the staff, when wearing the equipment, make sure that the equipment is not damaged or damp. Set up safety warning signs around the electrical test area to alert other personnel. Set the alarm threshold of the UHV DC magnetic field electrical test device. The staff will turn on the power switch of the electrical test device, start the electrical test function of the electrical test device, hold the insulating rod connected to the electrical tester, and gradually approach the transmission line. The electrical test device automatically collects magnetic field data and measures the magnetic field at the specified test point. When the magnetic field is higher than the alarm threshold, the sound and light alarm module will effectively alarm.

[0033] The present invention provides two embodiments as follows: Example 1 The straight tower power test position of the UHV DC transmission line in this embodiment is as follows: Figure 3 shown.

[0034] The UHV DC magnetic field electric test device comprises a UHV DC magnetic field electric test circuit, a UHV DC magnetic field electric test device housing 1 and a telescopic insulating rod 2.

[0035] The schematic diagram of the shell structure of the UHV DC magnetic field test device is as follows: Figure 1 The housing 1 of the UHV DC magnetic field test device can be connected to a retractable insulating rod 2 according to operation requirements.

[0036] The UHV DC magnetic field test circuit is encapsulated in the UHV DC magnetic field test device housing 1. Figure 2 The UHV DC magnetic field test circuit includes a magnetic field measurement module, a signal processing module, a main control module, an audible and visual alarm module, a switch module and a power supply module.

[0037] The magnetic field measurement module is used to collect magnetic field signals of the power transmission system. The signal processing module amplifies, filters and performs analog-to-digital conversion on the collected magnetic field signals. The main control module receives the magnetic field signal processed by the signal processing circuit, and determines whether to control the sound and light alarm circuit to send out a sound and light alarm signal according to a set threshold. The power supply module is used to supply power to the main control module, the signal processing circuit and the sound and light alarm module. The switch module is connected to the power supply module and is used to turn on or off the ultra-high voltage direct current magnetic field test device. The magnetic field measurement module is composed of a magnetic field sensor.

[0038] The working principle of the magnetic field sensor is as follows. When current is passed through the magnetic field sensor, according to Ampere's loop theorem, for any closed loop, the line integral of the magnetic field intensity H along the loop is equal to the algebraic sum of the area defined by the loop. The relationship between the magnetic field sensor current and the magnetic field can be simplified as

[0039] In the process of magnetic field testing, the magnetoresistance effect should be considered. It is a physical quantity that describes the obstacles encountered by the magnetic field when propagating in the magnetic circuit, and is related to the length, cross-sectional area and magnetic permeability of the magnetic core of the magnetic circuit. According to the definition of magnetic resistance,

[0040] in, is the vacuum permeability, is the relative magnetic permeability of the core material. Combining Ampere's loop law with the magnetic resistance formula, we get the relationship between the current in the electric field and the magnetic induction intensity under the magnetic resistance effect.

[0041] In the actual magnetic field test process, the magnetic field does not propagate completely along the expected magnetic circuit, but part of the magnetic field leaks out of the magnetic circuit. The magnetic field leakage coefficient must also be considered.

[0042] in, is the magnetic flux acting on the core, is the total magnetic flux. Due to the existence of leakage flux, the actual magnetomotive force acting on the magnetic core will be reduced, so there is

[0043] The magnetic induction intensity measured by the magnetic field sensor probe of the non-contact magnetic field tester is

[0044] in, is the magnetic permeability of air, is the relative magnetic permeability of the core medium.

[0045] The magnetic field sensor adopts a double iron core structure to superimpose the magnetic field signal and eliminate the induced potential of the transformer effect, thereby improving the measurement accuracy. Taking into account parameters such as the anisotropy constant, linear magnetostriction coefficient and material magnetic permeability, the electromagnetic parameters of the core material selected by the magnetic field sensor should be stable. The magnetic field sensor has a large measurement range. This wide measurement range enables it to adapt to different load application scenarios and improves the practicality of the sensor of the UHV DC electrical testing device. The magnetic field measurement module of the UHV DC magnetic field electrical testing device is made of magnetic materials, has stable temperature characteristics and long-term stability, and can still maintain high measurement accuracy under conditions such as temperature changes and environmental interference. The magnetic field value measured by the magnetic field measurement module is output through the communication interface 6, and the data signal is converted into a signal that can be read by the single chip microcomputer, and then transmitted to the single chip microcomputer for processing.

[0046] The main control module adopts STM32F407 chip, the core has high-speed processing speed, and the CPU operating frequency is up to 168MHz; it includes up to 6 USARTs, USB, FSMC, 3 high-speed SPIs, 2 12-bit DACs, 3 high-speed 12-bit ADCs, 512KB-1MB Flash and 192KB data storage.

[0047] The sound and light alarm module comprises a red LED light 3, a green LED light 4 and a loudspeaker 5.

[0048] Before performing the electrical test, first check the integrity of the tester casing to ensure that there are no cracks, breaks, or disconnections on the tester casing, and that there are no signs of oil, water stains, wear, etc.

[0049] Then perform a self-test on the tester. The operator presses the self-test button of the tester with his finger. If the tester can work normally, the tester will emit a continuous or intermittent alarm sound, and the indicator light should light up or flash. If there is no sound or light indication signal during the self-test, check whether the battery in the tester is correctly installed and whether the battery power is sufficient. If the battery power is insufficient, replace the battery before performing the self-test.

[0050] After the self-test is passed, the staff will conduct an electrical test in the actual high-voltage direct current transmission environment. The staff will wear personal protective equipment such as insulating gloves and insulating shoes, and climb up the crossarm to perform the electrical test. In order to ensure the safety of the staff, when wearing the equipment, it should be ensured that the equipment is not damaged or damp. Safety warning signs are set around the electrical test area to remind other personnel to pay attention. The staff turns on the power switch of the electrical test device, starts the electrical test function of the electrical test device, holds the insulating rod connected to the electrical tester, and gradually approaches the transmission line. The selection of the location of the electrical test device has a huge impact on the actual electrical test results. Improper selection of the electrical tester position is likely to cause the electrical tester to misreport or miss, thereby failing to accurately judge the actual operating conditions of the high-voltage direct current transmission line. In this embodiment, the operation mode of the ultra-high voltage direct current transmission line is single-pole full-voltage earth return line operation. The conductor of the ±800kV high-voltage direct current transmission system is a 6-split conductor, the conductor pole spacing is 22m, and the conductor height to the ground is 24m. The test range of the magnetic field sensor is ±500μT. The electroscope is located 2m outside the cross arm directly above the transmission line. The maximum magnetic flux density obtained by simulation is 395 , not exceeding the test range of the magnetic field sensor. The test device automatically collects magnetic field data, measures the magnetic field at the specified test point, measures each test point 5 to 10 times, selects the average measurement value as the final output result, and reads the output value of the sensor component. Set the alarm threshold of the UHV DC magnetic field test device to 50 100 ,When the magnetic field is higher than the alarm threshold, the sound and light alarm module will give an effective alarm.

[0051] Example 2 The straight tower power test position of the UHV DC transmission line in this embodiment is as follows: Figure 4 shown.

[0052] The UHV DC magnetic field electric test device comprises a UHV DC magnetic field electric test circuit, a UHV DC magnetic field electric test device housing 1 and a telescopic insulating rod 2.

[0053] The housing 1 of the electrical testing device can be connected to a retractable insulating rod 2 according to operational requirements.

[0054] The ultra-high voltage direct current magnetic field test circuit is packaged in a tester housing 1 .

[0055] The UHV DC magnetic field test circuit comprises a magnetic field measurement module, a signal processing module, a main control module, an audible and visual alarm module, a switch module and a power supply module.

[0056] The magnetic field measurement module is used to collect magnetic field signals of the power transmission system.

[0057] The signal processing module performs signal amplification, filtering and analog-to-digital conversion on the collected magnetic field signal.

[0058] The main control module receives the magnetic field signal processed by the signal processing circuit, and determines whether to control the sound and light alarm circuit to send out the sound and light alarm signal according to a set threshold value. The power supply module is used to supply power to the main control module, the signal processing circuit and the sound and light alarm module.

[0059] The switch module is connected to the power module and is used to turn on or off the ultra-high voltage direct current magnetic field electrical testing device.

[0060] The magnetic field measurement module is composed of a magnetic field sensor.

[0061] The magnetic field value measured by the magnetic field measurement module is output through the communication interface 6, and the data signal is converted into a signal that can be read by the single chip microcomputer, and then transmitted to the single chip microcomputer for processing.

[0062] The main control module adopts STM32F407 chip, the core has high-speed processing speed, and the CPU operating frequency is up to 168MHz; it includes up to 6 USARTs, USB, FSMC, 3 high-speed SPIs, 2 12-bit DACs, 3 high-speed 12-bit ADCs, 512KB-1MB Flash and 192KB data storage.

[0063] The sound and light alarm module comprises a red LED light 3, a green LED light 4 and a loudspeaker 5.

[0064] Before performing the electrical test, first check the integrity of the tester casing to ensure that there are no cracks, breaks, or disconnections on the tester casing, and that there are no signs of oil, water stains, wear, etc.

[0065] Then, perform a self-test on the tester. The operator presses the self-test button of the tester with his finger. If the tester can work normally, the tester indicator should send out a clear sound and light alarm signal. The sound and light alarm signal means that the tester should send out a continuous or intermittent alarm sound, and the indicator light should light up or flash. If there is no sound and light indication signal during the self-test, check whether the battery in the tester is correctly installed and whether the battery power is sufficient. If the battery power is insufficient, replace the battery before performing the self-test.

[0066] After the self-test is passed, the staff will conduct an electrical test in the actual high-voltage direct current transmission environment. The staff will wear personal protective equipment such as insulating gloves and insulating shoes, and climb up the crossarm to perform the electrical test. In order to ensure the safety of the staff, when wearing the equipment, it should be ensured that the equipment is not damaged or damp. Safety warning signs are set around the electrical test area to remind other personnel to pay attention. The staff turns on the power switch of the electrical test device, starts the electrical test function of the electrical test device, holds the insulating rod connected to the electrical tester, and gradually approaches the transmission line from top to bottom. The selection of the location of the electrical test device has a huge impact on the actual electrical test results. Improper selection of the electrical tester position is likely to cause the electrical tester to report false alarms or missed alarms, thereby failing to accurately judge the actual operating conditions of the high-voltage direct current transmission line. In this embodiment, the operation mode of the ultra-high voltage direct current transmission line is single-pole full-voltage earth return line operation. The conductor model of the ±800kV high-voltage direct current transmission system is 6×ACSR−720 / 50 split conductor, the conductor pole spacing is 22m, and the conductor height to the ground is 24m. The test range of the magnetic field sensor is ±500μT. The electroscope is located 2m outward from the tower body at the same level as the transmission line. The maximum magnetic flux density obtained by simulation is 94.89 , not exceeding the test range of the magnetic field sensor. The test device automatically collects magnetic field data, measures the magnetic field at the specified test point, measures each test point 5 to 10 times, selects the average measurement value as the final output result, and reads the output value of the sensor component. Set the alarm threshold of the UHV DC magnetic field test device to 50 100 ,When the magnetic field is higher than the alarm threshold, the sound and light alarm module will give an effective alarm.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A UHV DC magnetic field test device, characterized by: include: The shell of the electric test device and the retractable insulating rod, the shell of the electric test device encapsulates a magnetic field measurement module, a signal processing module, a main control module, an audible and visual alarm module, a power supply module and a switch module; the shell of the electric test device is connected to one end of the retractable insulating rod.

2. The UHV DC magnetic field test device according to claim 1, characterized in that: The magnetic field measurement module is used to collect magnetic field signals in the measured system; the signal processing module is used to receive the magnetic field signals collected by the magnetic field sensor and amplify, filter and perform data conversion processing on the magnetic field signals; the main control module is used to receive the magnetic field signals processed by the signal processing circuit and compare the processed magnetic field signals with the set threshold signal. If the magnetic field signal is greater than the set threshold signal, the main control module controls the sound and light alarm module to send out a sound and light alarm signal.

3. The UHV DC magnetic field electrical testing device according to claim 1, characterized in that: The UHV DC magnetic field electrical testing device also includes a switch module connected to the power module.

4. The UHV DC magnetic field electrical testing device according to claim 1, characterized in that: The UHV DC magnetic field electrical testing device also includes a power supply module.

5. The UHV DC magnetic field electrical testing device according to claim 1, characterized in that: The sound and light alarm module comprises a loudspeaker, a red LED lamp and a green LED lamp.

6. The UHV DC magnetic field electrical testing device according to claim 1, characterized in that: The magnetic field measurement module contains a magnetic field measurement sensor, which adopts a double iron core structure, and the measured value is output through a communication interface.

7. The UHV DC magnetic field electrical testing device according to claim 1, characterized in that: The shell of the electrical testing device encapsulates a magnetic field measurement module, a signal processing module, a main control module, an sound and light alarm module, a power supply module and a switch module; the main control module receives the signal processed by the signal processing module and compares it with the set threshold to control the sound and light alarm module to send out a sound and light alarm signal or be in standby mode.

8. The UHV DC magnetic field electrical testing device according to claim 1, characterized in that: The housing of the electrical testing device is connected to one end of the telescopic insulating rod.

9. The UHV DC magnetic field electrical testing device according to claim 1, characterized in that: The electroscope has a self-test function; Press the self-test button of the tester. If the tester can work normally, the test indicator should send out a clear sound and light alarm signal. The sound and light alarm signal means that the tester should send out a continuous or intermittent alarm sound, and the indicator light should light up or flash.

10. A method for testing electricity in a UHV DC magnetic field, characterized in that: Based on the implementation of the electrical testing device according to any one of claims 1 to 9, the method is as follows: turn on the power switch of the electrical testing device, start the electrical testing function of the electrical testing device, the electrical testing device automatically collects magnetic field data, measures the magnetic field at the specified test point, and when the magnetic field is higher than the alarm threshold, the sound and light alarm module issues an effective alarm.

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